#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N = 1e6+5;
int n,a[N];
signed main()
{
	freopen("india.in","r",stdin);
	freopen("india.out","w",stdout);
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin>>n;
	for(int i = 1;i<=n;i++) cin>>a[i];
	sort(a+1,a+n+1);
	int ans = 0,sum = a[1];
	for(int i = 2;i<=n;i++)
	{
		ans+=a[i]*(i-1)-sum;
//		cout<<ans<<' '<<sum<<'\n';
		sum+=a[i];
	}
	cout<<ans;
	return 0;
}

